This article explains why a currency can rise or fall even when a central bank holds interest rates steady. Currency markets don’t price in only the current decision; they compare it with previous expectations, then reassess the expected interest-rate differential between countries.

It may seem straightforward:

The central bank raises interest rates, and the currency rises.
It cuts them, and the currency falls.

But currency markets don’t always work that way.

After the U.S. Federal Reserve decided to hold rates between 3.75% and 4%, the dollar index fell by around 0.2%—even though the Fed hadn’t cut rates at all. That same day, the New Zealand dollar fell by around 1.74% after the Reserve Bank of New Zealand held its rate at 2.75%, while the Canadian dollar rose after the Bank of Canada raised its policy rate to 2.5%.

So how can two similar decisions—holding rates steady—lead to two completely different market moves?

Markets trade expectations before the decision

Before any central bank meeting, investors don’t wait for the announcement without forming expectations.

Markets try to anticipate what will happen, and those expectations are reflected in currency, bond, and stock prices.

So if everyone expects rates to stay put and they do, that information may already be priced in.

At that point, the question is no longer:

What did the central bank do?

Instead, it’s:

Did it say or do anything more hawkish or dovish than the market expected?

That helps explain how the dollar moved after the Fed meeting.

The decision to hold rates was widely expected, so investors focused on what it meant for the future path of monetary policy—not just the current interest rate.

Why did the New Zealand dollar fall further?

The New Zealand case shows how powerful a surprise can be.

The central bank kept its rate at 2.75% by a vote of four to three, even though much of the market had expected a quarter-point increase.

In other words, traders who bought the New Zealand dollar before the decision expecting rates to rise had to rethink their positions once the result came out.

Suddenly, the expected return on the currency was lower than the market had assumed just minutes earlier.

That’s why the fall was steeper.

Not because holding rates steady is always bad for a currency, but because the decision was less hawkish than expected.

Why do interest rates support a currency in the first place?

Global investors can choose to hold assets denominated in different currencies.

If bonds and deposits in one country start offering higher returns, demand for its currency may increase as investors buy those assets.

That’s why foreign-exchange markets pay attention to what’s known as the interest-rate differential between countries.

If Canada raises interest rates while another country leaves its rates unchanged, Canadian assets may become relatively more attractive, all else being equal.

That’s what happened when the Bank of Canada raised rates by 25 basis points to 2.5%, accompanied by a slight rise in the Canadian dollar.

But “relatively” is the key word.

Investors don’t just ask: What is Canada’s interest rate?

They ask: How does it compare with rates in the United States, Europe, and other alternatives—and where are rates headed next?

Sometimes the words matter more than the decision

Even when a central bank holds rates steady, its tone can move a currency.

If it says inflation remains a concern and another hike may be needed, the market may raise its expectations for the future path of interest rates.

But if it signals that inflation is easing and current policy is sufficient, the opposite may happen.

That’s why traders follow the statement, press conference, voting breakdown, and economic projections—not just the line announcing the rate decision.

Currencies price in the future

And that brings us to the most important idea.

A currency’s market price is not simply a reflection of a country’s economy today; it is a constant attempt to price in what may happen next.

That’s why two central banks can hold rates steady on the same day, yet one currency rises while the other falls.

A central bank can even raise rates and still see its currency fall if investors were expecting a bigger increase.

So when we see a sharp move after a central bank meeting, the better question isn’t:

Did it raise or cut interest rates?

It’s:

What did the market expect before the meeting, and how did the decision change its expectations for what comes next?

In currency markets, the surprise often matters more than the decision itself.